The land around Cambará do Sul looks unremarkable at first: open pasture, scattered araucaria pines, a horizon that goes on flat and green. Then you reach the rim. The plateau falls toward the coastal plain along a great escarpment, and where rivers have cut into that edge they have carved canyons of astonishing scale. Itaimbezinho, the most famous, runs roughly six kilometers long and plunges some 720 meters at its deepest, with walls that in places stand nearly two kilometers apart. Its name comes from the Tupi-Guarani for cut rock, and the description is exact. Stand at the Cotovelo overlook and the far wall seems close enough to touch, yet the river at the bottom is a thin silver thread. Two waterfalls, the Véu de Noiva and the Andorinhas, spill off the rim and dissolve into mist before they ever reach the ground. The canyon is not the only one. To the northeast lies Fortaleza, the fortress, whose basalt walls rise as much as 900 meters; from its lookout, on the clearest days, you can see all the way to the Atlantic.

Cambará do Sul is small, fewer than seven thousand people, but it carries an outsized responsibility. The town serves as the headquarters for two national parks, Aparados da Serra and Serra Geral, and through them controls access to the great canyons of the region, among them Itaimbezinho, Fortaleza, Churriado, and Malacara. Aparados da Serra, established in 1959, is one of the oldest national parks in Brazil; its name means cut mountains, the highlands sheared off where the plateau meets the sky. The municipality also holds part of Tainhas State Park, created in 1975. For a place that was only split off from neighboring São Francisco de Paula in 1963, Cambará do Sul has become the gateway through which most travelers reach this corner of the continent's wild edge.

There was no grand reason to settle this high, windswept ground, and for a long time few did. The municipality was only carved out of neighboring São Francisco de Paula in 1963, a latecomer even by the standards of the highlands. What Cambará do Sul offered instead was space and silence, and eventually those became the draw. The town reinvented itself as an ecotourism base: family-run pousadas, woodsmoke on cold evenings, gaucho cooking around the fire, and a mountain climate found almost nowhere else in Brazil. Visitors come for the canyons by day and the rare luxury of needing a blanket at night. When the temperature drops far enough and the moisture is right, the snow returns, and for a morning the highland looks less like South America than like somewhere very far south indeed. With roughly six thousand residents spread across more than 1,200 square kilometers, there is far more land here than there are people to fill it.

The best hours here belong to the early morning, before the cloud that so often pours up the canyon walls from the warm coast below. On clear days the long crack of Itaimbezinho holds the light in layers, basalt darkening as it descends, the forested floor still in shadow while the rim glows. Hawks ride the updrafts that rise off the cliffs. The plateau behind you stretches flat and pale with frost, and ahead the land simply gives way. It is the kind of place that rearranges your sense of scale, a quiet farming town one minute and the brink of a 700-meter drop the next.